Constructivist based students' worksheet development in learning environmental pollution

Students' worksheet is one of the learning tools to achieve learning objectives, to simplify teaching and learning process. However, the frequently used worksheet at schools was adapted from textbook with the key answers' availability. This research aims to develop constructivist-based students' worksheet to be feasible and useable for learning of environmental pollution. The research was carried out using research and development method (R&D) with ADDIE model. The research was conducted at SMPN 4 Banda Aceh during the academic year 2017/2018 in class VII-2 and VII-3. Data were collected using students' worksheet, written test and questionnaire and later the data were analysed with percentage equation. The finding exhibited that the constructivist-based students' worksheet was very good in accordance with feasibility assessment validated within average score of 0.87. Besides, learning achievement was categorized as good with a percentage of 82.21%. The responses to the worksheet obtained average percentage of 72.8% (strongly agree); 26.5% (agree) and 0.7% (disagree). Based on the results, it can be concluded that the worksheet was excellent and feasible to be used to achieve success in learning as well as positive responses from students.